How to File a Motion for Sanctions in Family Law

To file a motion for sanctions in a family law case, you document the other party’s misconduct in detail, give them the required warning and chance to fix it, then file a standalone motion with a supporting declaration, a legal memorandum, your exhibits, and proof of service on the opposing party. Family law is governed by state court rules, but most states follow the Federal Rules of Civil Procedure closely, so the steps below track that widely adopted model. Check your local rules for deadlines and formatting before you file.

Confirm the Conduct Is Actually Sanctionable

Judges reserve sanctions for behavior that genuinely obstructs the case or drives up costs, not ordinary friction between parties. Before you invest time in a motion, make sure the conduct fits one of the recognized grounds.

Discovery abuse is the most common trigger: ignoring requests for bank statements, giving evasive or incomplete answers, skipping a deposition, or hiding assets and submitting false financial disclosures. Under the federal model most state rules follow, an incomplete or evasive response is treated the same as no response at all.¹

Frivolous filings are another ground. Every document filed carries an implicit certification that it has a basis in existing law or a good-faith argument and that its factual claims have evidentiary support.² Repeated custody modification filings with no evidence of changed circumstances are a typical example.

Bad-faith conduct that no specific rule covers can also be sanctioned under the court’s inherent authority, as recognized in Chambers v. NASCO, Inc.³ In family cases this covers lying in sworn declarations, sabotaging settlement, or coaching a child to undermine a custody arrangement.

If the misconduct is willful violation of an existing court order, such as refusing court-ordered parenting time or stopping support payments, contempt is often the more direct remedy. That distinction is covered at the end of this article.

Complete the Safe Harbor Step First

You cannot skip past informal resolution. For sanctions aimed at frivolous filings, the widely adopted federal model requires you to serve the sanctions motion on the opposing party but not file it with the court. The other side then has 21 days to withdraw or correct the offending conduct. If they fix it in that window, you cannot file the motion.²

Discovery sanctions have a different prerequisite. Before filing a motion to compel, you must certify that you attempted in good faith to resolve the dispute without court involvement.¹ Many jurisdictions add a formal meet-and-confer requirement on top of that.

Document every step. Save the emails, letters, and phone logs showing when you served the motion or raised the dispute, what you asked for, and how the other side responded. Skipping this stage is one of the fastest ways to have a sanctions motion thrown out on procedural grounds, and judges want to see that you tried to resolve the problem before asking them to intervene.

Build the Evidence File

A sanctions motion lives or dies on its evidence. Vague complaints that the other side is uncooperative will not move a judge who sees this kind of accusation constantly.

Start with a detailed timeline. For each act of misconduct, record the date of the request or order, the deadline, every follow-up attempt, and the date it became clear the other party would not comply. If you are alleging a pattern rather than a single incident, the timeline is what turns scattered complaints into a coherent picture of obstruction.

Then gather the underlying documents. You want copies of the ignored discovery requests, emails and text messages showing refusal or evasion, and any communications where you or your attorney tried to resolve the issue. For hidden assets, bank records or financial documents that contradict sworn disclosures are your strongest evidence. For violation of a court order, obtain a certified copy of the order so the judge can see the exact directive that was disobeyed.

If you are asking for attorney’s fees, your lawyer’s billing records need entries that specifically correspond to work caused by the misconduct: time spent drafting the motion to compel, chasing unanswered discovery, or attending a hearing that would not have been necessary otherwise. A generic entry like “reviewed case file” will not support a fee shift. Judges scrutinize these records, and inflated or vague entries weaken the whole request.

Prepare and File the Motion Package

Once the safe harbor period has passed without a fix, you can file. The sanctions motion must be filed separately from any other motion and must describe the specific conduct you are challenging.² Do not bury a sanctions request inside a broader filing.

A typical package includes:

The motion itself, identifying the conduct and the sanction you are asking the court to impose.
A supporting declaration under penalty of perjury laying out the facts.
A legal memorandum explaining why the court should grant relief.
The documentary exhibits described above.
A proof of service showing you properly notified the other party.

Ask the sanction to fit the misconduct. The most common remedy is an order shifting the attorney’s fees the other side’s behavior caused you to incur. When a court grants a motion to compel, it must generally require the non-complying party to pay the movant’s reasonable expenses unless the failure was substantially justified.¹ Sanctions for frivolous filings must be limited to what is sufficient to deter similar conduct.² Judges can also strike evidence, prohibit certain arguments, treat disputed facts as established against the non-complying party, or in extreme cases dismiss a claim or enter default. Terminating sanctions for electronically stored information require a finding that the party acted with intent to deprive the other side of the evidence.

Filing fees vary by jurisdiction, so check with your local court clerk. After filing, the clerk assigns a hearing date and the other party has the right to file a written opposition. Watch your court’s deadlines for service and for filing the proof of service. Missing them can get the hearing continued or the motion denied outright.

At the Hearing

Both sides argue their positions to the judge. As the moving party you typically go first: describe the misconduct, walk through your evidence, and identify the sanction you want. The other party responds. Some courts allow brief live testimony, but sanctions hearings are often decided on the written declarations and exhibits.

The judge evaluates whether the conduct occurred, whether it was willful or merely negligent, and what penalty fits. Courts are reluctant to impose harsh sanctions for honest mistakes; the line between a party who could not locate a document and one who deliberately hid it matters a great deal. If the judge grants the motion, the order must describe the sanctioned conduct and explain the basis for the penalty.²

Understand the Risks Before You File

A sanctions motion cuts both ways. If you lose, a court that denies a motion to compel discovery must generally require the unsuccessful movant to pay the other side’s reasonable expenses in opposing it, unless the motion was substantially justified.¹ Losing is not neutral.

The motion itself is also subject to the standards it invokes. Putting your name on it certifies that you conducted a reasonable inquiry and are not filing to harass, delay, or drive up costs.² A meritless sanctions motion can itself be sanctioned.

There is a strategic dimension as well. Judges form impressions of parties over the life of a case. Multiple weak sanctions motions suggest you are more interested in fighting than resolving the case, and that impression can shape discretionary rulings on custody, support, or fees. Make sure your own discovery and deadlines are in order before asking the court to penalize someone else; expect the other side to point to any lapses of your own.

Sanctions or Contempt

People routinely confuse these two remedies. Sanctions address litigation misconduct: discovery abuse, frivolous filings, bad-faith behavior during the case. The goal is to compensate the harmed party and deter future misconduct. Contempt addresses willful disobedience of a specific court order, and it carries coercive power that sanctions do not, including the ability to jail a party for civil contempt until they comply.

If you need to force compliance with an existing order for support or parenting time, contempt is usually the sharper tool. If you need to penalize obstruction of the litigation process and recover the costs it caused, a sanctions motion is the right vehicle. Sometimes both apply. A party who defies a discovery order can face both sanctions under discovery rules and contempt for violating the court’s directive.¹ An attorney familiar with your local rules can help you pick the remedy that fits what you actually need to happen next.

1
Legal Information Institute. Federal Rules of Civil Procedure Rule 37
2
Office of the Law Revision Counsel. Federal Rules of Civil Procedure Rule 11
3
Legal Information Institute. Inherent Powers over Contempt and Sanctions